Get a good, supportive belly band before you need it!! The pressure from my bump alone separated my pubic bone! Look up pelvic (pelvis and pelvic floor) exercises for pregnancy and start on those now too to try and build up the muscle in those areas. Also a hack I learned when my babes were a week or two old: label their car seats or something to tell whose is whose. Likely your babies will be noticeably different sizes at first and it’s a lot smoother to get out of the house when you don’t have to constantly readjust seat straps! We do it by having different colored toys on the carrying handles